I've run a little less than 5ozs through my Wasp .061, and it's already holding a pretty lean setting. It "feels" or sounds like it can still gain a bit more with further running. I didn't want to push it too soon, so I had it one or two clicks back from the leanest setting it would take before sagging. I'm really happy with it so far, and I plan to buy more down the road. I think as long as you mount it on models weighing around 1lb and less, it will prove to be a fine engine. As far as I'm concerned the collectors can keep their NIB Norvels.

BTW, I was reading on the Norvel web site (yes, someone's still paying to keep it live) that in 2001 they borrowed about $2M for new CNC machines. I wonder if maybe they defaulted on that loan and had to sell off the equipment. That's a huge debt to try and pay back by selling 1/2A engines (unless they were making other products, too).